Constraints on Topological Defects Energy Density from First-Year WMAP Results
| dc.creator | Fraisse, Aurélien A. | |
| dc.date | 2005-03-17 | |
| dc.date | 2006-03-23 | |
| dc.date.accessioned | 2026-07-07T06:37:08Z | |
| dc.date.available | 2026-07-07T06:37:08Z | |
| dc.description | We compare the predictions of hybrid inflationary models that produce both adiabatic fluctuations and topological defects to first year WMAP results. We use a Markov Chain Monte Carlo method to constrain the contribution of cosmic strings and textures to the CMB angular power spectrum. Marginalizing this contribution over the cosmological parameters of a power law flat LCDM model, we place a 95% upper limit of 23% on the topological defects contribution to density fluctuations, the maximum likelihood being of order 4%. This corresponds to an upper limit on the string scale of Gμ\leq 3.2 \times 10^{-7}. We also explore the degeneracies between the defects contribution and other cosmological parameters. | |
| dc.description | 8 pages, 2 figures, final version | |
| dc.identifier | https://arxiv.org/abs/astro-ph/0503402 | |
| dc.identifier | http://arxiv.org/abs/astro-ph/0503402 | |
| dc.identifier.uri | http://salesiana.dossiersoluciones.com/handle/123456789/100291 | |
| dc.subject | Astrophysics | |
| dc.title | Constraints on Topological Defects Energy Density from First-Year WMAP Results | |
| dc.type | text |